JPH0783982A - Tester for connection of multiple-pair connector - Google Patents

Abstract

PURPOSE:To simply and effectively inspect propriety of connection of cable conductors of a multiple-pair connector to be provided at an end of a communi cation cable formed by twisting many cable conductor twins each having a pair of cable conductors by one inspector in a short time. CONSTITUTION:A multiple-pair connector 6 provided at an end of a communication cable 2 is electrically connected to a wire gage switching unit 10, a wire gage switching unit 10 is sequentially switched in a wire gage number order of cable conductor pairs 5, and an electrostatic capacity of the pair 5 is detected by electrostatic capacity detecting means 12. When predetermined cable conductor pair 5 are connected to a pair of connecting terminals of the connector 6, a signal indicating complete connection is output from the means 12, and hence the unit 10 is automatically switched by control means 14 in response to it to continue its onspection. On the other hand, when a connection of the pair 5 with the connector 6 is incomplete, a signal indicating incomplete connection is output from the means 12, and hence informing means 16 informs connection defect of the conductor 3 with the connector 6 in response to it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection of a multi-pair connector provided at an end of a communication cable formed by twisting a plurality of cable core wire pairs consisting of a pair of cable core wires, with the cable core wire. The present invention relates to a multi-pair connector connection inspection device for inspecting quality.

[0002]

2. Description of the Related Art In general, a communication cable is a so-called unit type multi-pair cable in which a plurality of cable core wire pairs consisting of a pair of cable core wires are twisted into one cable unit, and a plurality of these cable units are further twisted. There is. And in this type of communication cable, for each cable core wire, so that each cable core wire can be identified,
It is colored black, yellow, white, and so on.

By the way, in order to lay a communication cable over a long distance, it is necessary to sequentially connect the ends of each communication cable to each other. For connecting such a communication cable, a plurality of cable core pairs (for example, 10
A multi-pair connector may be used to connect pairs) at once.

Conventionally, the connection of a communication cable using such a multi-pair connector is performed by individually connecting the cable core wires to the multi-pair connector at the installation site of the communication cable, and then further connecting the multi-pair connectors to each other. Are connected to each other.

However, it takes time and effort to individually connect the cable core wires to the multi-pair connector at the connection ends of the communication cables at the installation site.
Connection work becomes extremely complicated. For example, if the communication cable is composed of 3,000 pairs of cable cores, 6,000 wires are provided at each end of the communication cables to be connected to each other, and therefore, two wires are connected to each other.
× 6,000 = 12,000 cable cores must be individually connected to the multi-pair connector by hand, and such a large amount of connection processing can be done in a manhole where the working environment is not good for a long time. Since it is carried out across the road, there are problems such as safety and health of workers and obstruction of traffic due to road occupation.

[0006] Therefore, in order to save the trouble of such connection work on site as much as possible, it is considered to attach a multi-pair connector to the end of the communication cable in advance at the time of shipping the product of the communication cable.

In order to completely eliminate the work of connecting the multi-pair connector and the cable core wire in the field, a multi-pair connector is provided at each of the winding start side and the winding end side of the drum-wound communication cable. The product may be shipped after being attached in advance. However, when a large number of multi-pair connectors are also connected to the other end on the winding end side, the communication cable cannot be inserted into the conduit buried underground and the communication cable cannot be laid.

Therefore, in practice, the multi-pair connector can be attached only to one end on the winding start side of the communication cable shipped by winding the drum, and the other end on the winding end side is still on site. The work of connecting the multi-pair connector is required.

However, even if the multi-pair connector is connected to one end of the communication cable in advance at the time of shipping the product, the time and effort required for the connection work on the site are reduced by half as compared with the conventional method, so that the labor saving in the field construction can be achieved. And still valid.

[0010]

By the way, when a multi-pair connector is attached to an end of a communication cable in advance before shipment, each cable core wire constituting the communication cable has a predetermined connection terminal of the multi-pair connector. It is necessary to individually check whether or not they are definitely connected.

In order to inspect whether the connection between the multi-pair connector and the cable core wire is good or bad, it is conceivable to use, for example, a commercially available continuity inspection device dedicated to the multi-pair connector.

However, in order to use such a commercially available continuity inspection device, not only the winding start side of the communication cable,
Attach a multi-pair connector separately to the end on the winding end side,
It is necessary to inspect in this state. Then, when the communication cable is shipped as a product, the multi-pair connector on the winding end side, which has been carefully attached, is to be removed, and therefore, extra labor is required to attach and detach the multi-pair connector.

While the two inspectors contact each other,
Talk to the end of the winding start side where the multi-pair connector of the communication cable is attached and the end where the multi-pair connector is not attached, and check the cable core between the corresponding wire numbers each time. It is conceivable to use a method of individually checking whether the connection is good or bad. However, in this case, two inspectors are required, and it takes time for the inspection.

The present invention has been made in view of the above problems, and a single inspector can quickly determine whether or not the connection between the cable core of the multi-pair connector connected to the end of the communication cable is good or bad. The challenge is to ensure that the inspection can be performed within the room.

[0015]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention is provided at the end of a communication cable formed by twisting a large number of cable core wire pairs consisting of a pair of cable core wires. A multi-pair connector connection inspection device for individually inspecting the quality of connection of a pair connector to the cable core wire has the following configuration.

That is, in the device according to the present invention, a wire number changer for sequentially selecting each connection terminal with the cable core wire of the multi-pair connector for each cable core wire pair, and this wire number switcher. The capacitance C generated in the cable core wire pair connected through the pair of connection terminals of the selected multi-pair connector is detected, and the absolute difference between the capacitance C and the standard capacitance C ₀ is detected. When the value is within a predetermined value ε (| C-C ₀ | ≤ ε), a good connection signal is output, and when the value is out of the predetermined value (| C-C ₀ |>
In (ε), a capacitance detecting means for outputting a connection failure signal, and a control for sequentially switching the wire number changer based on this signal when a good connection signal is output from the capacitance detecting means. And means for notifying the connection failure of the cable core wire to the connection terminal of the multi-pair connector based on this signal when a connection failure signal is output from the capacitance detection means. .

[0017]

In the above structure, in the connection inspection of the multi-pair connector, the multi-pair connector provided at the end of the communication cable is electrically connected to the wire number switch.

Then, when the connection inspection is started, the wire number changer connects each connection terminal with the cable core wire of the multi-pair connector,
For each cable core pair (that is, for each pair of cable cores)
Select individually for each.

At this time, when the required cable core wire pair is connected to the connection terminal of the multi-pair connector selected by the wire number switcher, the cable core wire pair selected by the wire number switcher is connected. Since the generated electrostatic capacitance is within the range of the preset variation, the electrostatic capacitance detection means outputs a connection good signal in response to this. If the required cable core wire pair is not connected to the connection terminal of the multi-pair connector selected by the wire number switcher, the capacitance generated in the cable core wire pair selected by the wire number switcher. Exceeds the preset variation range, the electrostatic capacitance detection means accordingly outputs a connection failure signal.

When this good connection signal is input, the control means sequentially switches the wire number switching device to another pair of connection terminals of the multi-pair connector corresponding to the next cable core wire pair.

On the other hand, when the poor connection signal is input, the control means drives the informing means accordingly,
A lamp, buzzer, etc. will notify the poor connection of the cable core wire. Therefore, in this case, the repair can be performed so that the cable core wire is connected to the predetermined connection terminal of the multi-pair connector.

[0022]

1 is a block diagram of a multi-pair connector connection inspection apparatus according to an embodiment of the present invention.

In the figure, reference numeral 1 denotes the whole multi-pair connector connection inspection apparatus, 2 is a communication cable, and 3 is a drum around which the communication cable 2 is wound.

The communication cable 2 of this embodiment is a so-called unit type in which a plurality of cable core wire pairs 5 consisting of a pair of cable core wires 4 are twisted into one cable unit, and a plurality of these cable units are twisted together. It is a multi-pair cable.

A multi-pair connector 6 is provided at one end of the communication cable 2 on the winding start side of the drum 3, and each multi-pair connector 6 includes 10 pairs of cable core wires 5.
(Therefore, 20 cable core wires 4) can be connected at one time.

Reference numeral 8 denotes a rescue pull for connecting each multi-pair connector 6, and 10 each connection terminal (not shown) to the cable core wire 4 of the multi-pair connector 6 for each cable core wire pair 5 (that is, twisted together). It is a wire number changer that selects sequentially for each of the two cable core wires 4).

Numeral 12 detects the electrostatic capacitance generated in the cable core wire pair 5 connected through the pair of connection terminals of the multi-pair connector 6 selected by the wire number switcher 10, and the electrostatic capacitance is predetermined. The capacitance detecting means outputs, for example, a high level good connection signal when the variation is within the range and a low level poor connection signal when the variation exceeds a predetermined range.

Reference numeral 14 is a control means for sequentially switching the line number switching device 10 based on this signal when a good connection signal is output from the electrostatic capacitance detection means 12, and for example, a microcomputer is applied.

When a connection failure signal is output from the electrostatic capacitance detection means 12, reference numeral 16 is a notification means for notifying the connection failure of the cable core wire 4 to the connection terminal of the multi-pair connector 6 based on this signal. Therefore, for example, an alarm lamp or an alarm buzzer is applied. 18 prints out data such as the wire number of the cable core wire 3 at the connection failure point,
A printer or a CRT display is applied as a data output device for displaying the data as an image.

With reference to the flow chart shown in FIG. 2, the operation in the case of inspecting the quality of the connection of the cable core wire 3 to the connection terminal of the multi-pair connector 6 using the multi-pair connector connection inspection device 1 having the above-mentioned configuration will be described. Explain.

Prior to the inspection, the multi-pair connector 6 provided on the end of the communication cable 2 on the winding start side of the drum 3 in advance.
Are connected to the rescue loop 8 of the multi-pair connector connection inspection apparatus 1 in the order of connector numbers (step 1).

When the inspection is started by operating a start switch (not shown) or the like, the control means 14 first sets the core wire pair number i corresponding to each cable core wire pair 5 to "1". (Step 2), the wire number switching unit 10 is switched so that the cable core wire pair 5 corresponding to the core wire pair number i (= 1) is electrically connected to the pair of connection terminals of the multi-pair connector 6. (Step 3).

In this state, the capacitance detecting means 12 detects the capacitance C of the cable core wire pair 5 connected to the pair of connection terminals of the multi-pair connector 6 selected by the wire number switcher 10. The absolute value of the difference between the detected capacitance value C and the standard value C _{0 of the} capacitance of the communication cable 2 is compared with a preset variation limit value ε.

Here, the capacitance C between the two conductors is approximately given by the following equation.

C≈πεL / [ln (2a / r _i ) · {(r _n ² −a ² ) / (r _n ² + a ² )}] (1) where ε is the effective dielectric of the insulator between the conductors Rate, r _i is the radius of the conductor, 2 a is the distance between the conductors, rh is the equivalent shielding radius when the other conductor is regarded as a shield, and L is the cable length.

Now, as shown in FIG. 3 (a), the quads 20 and 21 formed by twisting two cable core wire pairs 5 each consisting of a pair of cable core wires 4 (for four cable core wires 4).
When focusing on two bundles of, for example, one quad 20
The pair of cable core wires 4 colored in “blue” and “white”, respectively, and the pair of cable core wires 4 colored in “yellow” and “white” in the other quad 21, respectively, The cable core wire 4 is satisfactorily connected to the predetermined connection terminal 22 of the multi-pair connector 6, but is colored "brown" in one quad 20 and the same "brown" in the other quad 21. It is assumed that the cable core wires 4 that have been disconnected are erroneously connected by mistake.

In this case, when the connecting terminal 22 of the multi-pair connector 6 corresponding to the cable core wire 4 colored in "blue" and "white" of the one quad 20 is selected by the wire number changer 10. , The pair of cable core wires 4 are kept at substantially the same intervals along the axial direction of the communication cable 2, so that ε, r _i , a, and rh in the equation (1) are unique values of the communication cable 2. Therefore, the absolute value of the difference between the capacitance C generated in the selected pair of cable core wires 4 and the standard value C _{0 of the} capacitance is the preset limit value ε of variation.
Within the range (| C−C ₀ | ≦ ε).

On the other hand, the "brown" of one quad 20
When the connection terminal 22 of the multi-pair connector 6 corresponding to the cable core wire 4 colored with and "black" is selected by the wire number switching device 10, the distance between the pair of cable core wires 4 is good. Since it is larger than the distance between the cable cores 4 connected to, the ε and r _{i in} equation (1) do not change,
As a result of increasing a and rh, the absolute value of the difference between the electrostatic capacitance C generated in the pair of cable core wires 4 and the standard value C ₀ of the electrostatic capacitance exceeds the preset limit value ε of variation.
(| C−C ₀ |> ε).

Further, as shown in FIG. 3B, the pair of connection terminals 22 of the multi-pair connector 6 selected by the wire number changer 10 are connected.
If one of the two cable core wires 4 to be connected to is broken, the electrostatic capacitance C generated in the cable core wire pair 5 is substantially zero, and the electrostatic capacitance detection means 12 detects the electrostatic capacitance. The absolute value of the difference between the electrostatic capacitance C and the standard value C ₀ of the electrostatic capacitance exceeds a preset variation limit value ε (|
C-C ₀ |> ε).

Further, as shown in FIG. 3C, the pair of connection terminals 22 of the multi-pair connector 6 selected by the wire number changer 10 are connected.
Two cable cores 4 to be connected to each individually
Is commonly connected to the same connection terminal 22, the electrostatic capacitance C generated in the pair of cable core wires 4 is substantially zero, and the electrostatic capacitance detected by the electrostatic capacitance detection means 12 is small. The absolute value of the difference between C and the standard value C ₀ of the electrostatic capacitance exceeds a preset variation limit value ε (| C−C ₀ |>
ε).

Further, as shown in FIG. 3 (d), the pair of connection terminals 2 of the multi-pair connector 6 selected by the wire number changer 10 are connected.
If one of the two cable core wires 4 to be connected to 2 is commonly connected to another connection terminal 23,
The capacitance C generated at the connection terminal 23 and the standard value C of the capacitance
The absolute value of the difference from ₀ exceeds a preset variation limit value ε (| C−C ₀ |> ε).

From the capacitance detecting means 12, the absolute value of the difference between the capacitance C generated in the pair of cable core wires 4 and the standard value C _{0 of the} capacitance is set to a preset limit value of variation. If it is within the range of ε (| C−C ₀ | ≦ ε), the high level connection good signal accordingly exceeds the variation limit value ε (| C−C ₀ |> ε). A low level connection failure signal is output to each.

When a high-level good connection signal is input from the electrostatic capacitance detection means 12, the control means 14 makes sure that a predetermined cable core wire pair 5 is properly connected to the connection terminal of the multi-pair connector 6. (Step 5), the core wire pair number i is incremented by 1 (step 6). Then, it is judged whether or not the core wire pair number i (= 2) is the total number i _max of the cable core wire pairs 5 constituting this communication cable 2 (step 7), and the total number i _max is satisfied. If not, the process returns to step 3 so that the capacitance number detecting means 12 is connected to the pair of connecting terminals of the multi-pair connector 6 corresponding to the core wire pair number i (= 2). Switch.

Thereafter, the control means 14 automatically repeats step 3 to step 7 every time a high level good connection signal is input from the electrostatic capacitance detection means 12, thereby automatically changing the wire number switcher 10. Are switched and the connection inspection is continued for the cable core wire pair 5 of each core wire pair number i.

On the other hand, when the low level connection failure signal is input from the capacitance detection means 12, the control means 14 connects the predetermined cable core wire 4 to the connection terminal of the multi-pair connector 3. If not, the connection is judged to be defective (step 5), the core wire pair number i of the cable core wire pair 5 with the defective connection is output to the data output device 18, and it is displayed and notified. The means 16 is driven to notify the poor connection by a buzzer or the like (step 8). After the notification of the poor connection, the process proceeds to step 6, the core wire pair number i is incremented by one, and the capacitance detecting means 12 is electrically connected to the cable core wire pair 5 corresponding to the next core wire pair number i. The wire number switch 10 is switched so as to be connected to.

In this way, after the wire number switch 10 is switched by the total number i _max of the cable core wire pairs 5 forming the communication cable 2 and the electrostatic capacitance is detected by the electrostatic capacitance detecting means 12, the inspection is performed. This is the end (step 9).

After the above inspection, referring to the data output to the data output device 24 in step 8, each cable core wire of the cable core wire pair 5 corresponding to the core wire pair number i having the defective connection point Repair is performed so that 4 is connected to a predetermined connection terminal of the multi-pair connector 6.

[0048]

According to the present invention, it is possible for one inspector to surely inspect within a short time whether the connection between the cable core of the multi-pair connector connected to the end of the communication cable is good or bad. become.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a multi-pair connector connection inspection device according to an embodiment of the present invention.

FIG. 2 is a flowchart for explaining an inspection procedure of the device.

FIG. 3 is an explanatory diagram showing a relationship between a connection state of a cable core wire to a connection terminal of a multi-pair connector and an electrostatic capacitance generated in the cable core wire pair in this case.

[Explanation of symbols]

1 ... Multi-pair connector connection inspection device, 2 ... Communication cable, 3
... drum, 4 ... cable core wire, 5 ... cable core wire pair, 6
... multi-pair connector, 10 ... wire number switcher, 12 ... electrostatic capacitance detection means, 14 ... control means, 16 ... notification means, 22 ... connection terminal.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takashi Kaneko 4-3 Ikejiri, Itami-shi, Hyogo Prefecture Itami Works, Mitsubishi Cable Industries, Ltd. (72) Shin-Etsuro Mami 4-chome Ikejiri, Itami-shi, Hyogo Mitsubishi Cable Industries Itami Manufacturing Co., Ltd.

Claims (1)

[Claims] 1. An individual inspection for the quality of connection of a multi-pair connector provided at an end of a communication cable formed by twisting a plurality of cable core wire pairs each consisting of a pair of cable core wires with the cable core wire. A wire number selector for sequentially and individually selecting each connection terminal with the cable core wire of the multi-pair connector for each cable core wire pair, and the wire number selector The electrostatic capacitance C generated in each cable core wire pair connected via a pair of connection terminals of the multi-pair connector is detected, and the electrostatic capacitance C and the standard electrostatic capacitance C are detected.
_When the absolute value of the difference from ₀ is within a predetermined value ε (| C−C ₀ | ≦ ε), a good connection signal is output, and when it is out of the predetermined value (| C−
C ₀ |> ε) respectively, a capacitance detecting means for outputting a connection failure signal, and when a good connection signal is output from the capacitance detecting means, the wire number switching device is based on this signal. And a notification means for notifying the connection failure of the cable core wire to the connection terminal of the multi-pair connector based on this signal when a connection failure signal is output from the capacitance detection means. A multi-pair connector connection inspection device, comprising: